This module generates an Unocc Status for the AHU zone temperature control applications. When not in Unoccupied, the Unocc Status is Unocc Cntrl Not Req’d which allows other sequencers to control the devices. When unoccupied, the zone temperature is monitored to determine when the temperature exceeds the band specified by the two unoccupied temperature setpoints. When this occurs, the Unocc Status is set to the appropriate heating or cooling state. The module remains in this state until the appropriate setpoint has been satisfied for the Satisfied Timer Duration. After that period of time the status is set to Satisfied.
When unoccupied, if the temperature is unreliable, the Unocc Status is set to Temperature Unreliable.
For information on how the FSM determines the state, see FSM (AHU Zone Unoccupied Sequencer).